Calling device.



0. E. RASMUSSEN.

CALLING DEVICE.

.APPLICATION FILED JULY 24.1917.

1,293,545. I Patented Feb. 4, 1919.

bi l/@1172) 7 Us vw/a If Rasmussen description.

.OSVALD E. RASMUSSEN, or wEs'r HOBOKEN, NEW JERSEY, nssrsnon To wnsrnruvELECTRIC comrnnznrcoaroaernn, or NEW YORK, N. Y., A oonroaa'rron or NEWYORK.

Hudson and State of New J ersey, have invented certain new and usefulImprovements in Calling Devices, of which the. following is a. full,c1ear,.concise, and exact .This invention relates to calling devices,

. and more particularly to calling devices for automatic andsemiautomatic telephone systems.

of the calling device cannot be operated a An ob'ect of this inventionis to provide an improved arrangement, whereby the dial second' timeuntil the transmission'of impulses resulting from a previous actuatlonof the dialhas been completed. 1

Another object of this invention is the provision of improved means 3for hiding during the transmission of the impulses,

the symbols normally'visible through the I finger holes ofthe dial.

it In general, the calling device embodying the present inventionconsists of means for permitting the dial to rotate backward a smallportion of its forward rotation, and

; nism, and for locking thedial against further rotation in eitherdirection during the 1 Operation of the impulse mechanism. The

dial is locked in such a position that the symbols normally seen throughthe finger holes ofthe dial are hidden by the portion of the dialbetween adjacent finger holes.

- v The drawing showsa perspective view of the sender withits caseremoved so that the operating parts of the mechanism may be moreclearlydisclosed. The sender 1s provid ed with the shaft 10, rotatably mountedin thebottomjof the case (not shown). A finger dial 11 is fastened tothe upper end of this shaft and has holes whereby it may bejoperated.Normally, these holes are directly above symbols on astationa-ry plate'12, which is fastened to thecase in any suitable manner. This platealso servesas the upper support of the shaft 10. The

- toothed wheel 1 is fastened to the lower end of. the shaft 10.

One end of a coil s ri gs is fastened. to

Specification of Letters Patent.

speed of rotation of said wheel. stationary plate 12 and the impulsewheel 1 wheel 6.

CALLING DEVICE.

Patented Feb. 4, 18 19.

Application filed July 24, 1917. Serial No. 182,489.

the wheel 1, and the other end is fastened to a pin 14 mounted upon animpulse wheel .6. This impulse wheel is loose on the shaft 10 andcarries a plurality of upwardly pr0- jecting pins 15, which are arrangedto engage the contact spring 16 during rotation of the wheel, andthereby open the contact between springs 16 and 17. The wheel 6 isnormally prevented from rotating by a dog 7 which is carriedby a lever8, pivoted in the bottom of the case by screw 30. The

wheel 6 meshes with pinion 18 which may be connected by means of'theshaft 19 to any well-known type of governor to control the Between 6 ahub cam t -is mounted upon the shaft '10. -This cam is arranged to movelongitudinally on the shaft, but rotates therewith. A spring 22 normallyholds a cam portion20 of the hub-cam in a groove of a sleeve 21, whichis fastened to the impulse The hub oam has a flange 24.- which engagesone end of a bell crank lever 5, which is pivotally mounted on aprojection 13 ofthe plate 12. v The other end of the bell crank leverengages one end of the of the lever 8 and thereby rock the lever aboutits pivot 30.- The otherend ofthe Y lever 25 controls a pawl 3 which isin operative relation to the toothed wheel 1. A spring 28 is fastened tothe projection 29 of the lever 8 and to the case (not shown) in such amanner that its line of action may be changed from one side of the pivot30 to the other side by the movement of the lever 8 so as to hold thelever 8 in whatever position it is moved. v

,The operation of the device is as follows:

Movement of the dial 11 in a clockwise direction through an anglecorresponding to-the digit selected, moves the shaft 10 and the toothedwheel 1, and also places the spring 2 ward due to the tension of thespring 2, but i as soon as'a tooth of the wheel engages the pawl 3 itrocks the lever 8 about its pivot point 30. This movement of the lever 8moves the projection 9 into engagement with the toothed wheel andprevents further rotation thereof. This movement of the lever 8 alsoremoves the dog 7 out of engagement with the impulse Wheel 6, which isnow free to move under the influence of'the'spr'ing 2 and the governor(not shown) attached to the shaft 19. This slight backward movement ofthe dial 11, produced before the toothed wheel 1 is locked, issuflicient to move the dial so that the portionsther'eof, which arebetween the finger holes, cover-up the symbols" on the'stationar'y'plate 12. In this way the symbols remain covered up until the toothedwheel 1 is released. When the impulsewheel 6 has been rotated in" aclockwise direction and has produced the predetermined number ofimpulses in the circuit through the contaotjsprings- 16-- and I 17;thegroove ofthesleev'e 21 will be brought back into engagement with thecam 20 of the hub cam 4. This groove of the sleeve-21 is 50- arrangedthat the cam 20 will drop down intoit before the spring 2-hastransmitted all-the energy that was stored up in it by the clockwiserotati'on of the dial: As soon as the cam 20"drops down into the groovethe bell'crank levers is moved'back intoits normal position.Thisymovement of thebell'c'rank lever rocksthe lever 8, which moves thedog ]7 intoen'gage'ment with the impulse wheel 6', and thereby stops-itfrom further rotation. Itwill, therefore, be seen that the impulsewheel 6 is stopped rotating before cam'20 has reached itsnormal'position in thegroove of the sleeve 21; Since the movement of thelever 8' also r'emovesdog 9 from engagement with thetoothed wheel 1andthe return movement of the bell crank lever 5 moves the lever 25-soas to withdraw pawl 3 from engagement with the wheel 1, this wheel 1 isfree to rotate. The energy, which is still left in the coilspring 2,will, therefore, rotate this wheel 1 counter-clock wise the slightamount necessary for the cam 20'to assume its normal position. Thisslight 'rotation of the toothed wheel issuflic'i'ent,

however, to move'the dialso that the; symbols are again, visible throughthe finger holes. All parts ofthe sender are now in their-normalpositions and the sender is in position for a subsequent operation.

Vvhat is claimed is: y 1. In a calling device. a rotatable dial havingfinger holes, a stationary member carrying symbols normally visiblethrough operation of said said finger holes, an impulsetransmittingmechanism, means for operating-said mechanism, and means for lockingsaid dial in a position to hide said symbols during the impulsetransmitting mechanism. v

.2...In a calling device, 'a' rotatable dial having finger holes, astationary member carrying symbols normally visible a, through saidfinger holes, p, an impulse transmitting mechanism, ineansfor operatingsaid mechanism, means for locking said dial in aposition to hide saidsymbols-during the. operation of said impulse transmitting mechanism,andmeans operated at the end of the operation: of said mechanism forreleasing. said dial" and moving it into a position in which saidsymbol-s are visible through's'aid finger hole's'.. V

3. In a calling device, a rotatabledial'having finger holes, astationary member may in g symbols normally visible through said fingerholes, an impulse wheel, means for rotating said impulse wheel inacoordanc'e with the forward rotation of said dial, means, for rotatingsaid diamiackward a small portion ofits' forward rotation, and

4. In a calling device, a rotatable'dial hav ing finger holesyastationary member carr ing symbols normally visible through said fingerholes, an impulse wheel, mean -for rotating said impulse wheel in"accordance with the forwaramtation of said dial,"

means for rotating said aialxbackwara a small portion of "its fo wardrotation, means operated by said backwirrd movement for releasingsaid/wheel and forloelnn --said dial in a position to'hicle said symbo's-dun ingthe movement. ofth'e' wheel, and means operated at the end. ofthe operation of said wheel for moving said dial into a position inwhich said symbols are visible through said finger holes.

5. In a calling device, a rotatable dial; an impulse wheel, means forrotating the impulse wheel in-acc'ordance with the forward rotation ofsaid clial, means for locking the wheel against rotation during theforward rotation ofthe dial, means for rotating said dialjbackward asmall portion-ofits forward rotation when said dial is-'relea'sed andmeans operated by said. backward rotation for releasing saidimpulsejwheel' and 'forlocking saiddial against rotation in" eitherdirection during-the movement ofsaid wheel.

6. In a calling; device, a dial, an impulse wheel, connecting meansbetweenthennwheel'a distance each time in response tofthe forwardrotation of the dial, meansfor looking the impulse wheelagainst-rotation, and

pulse wheel and the dial for rotating the means controlled by the dialfor releasing the impulse wheel and for locking said dial againstrotation in either direction during the movement of said wheel.

7 In a calling device, an impulse transmitting mechanism, a rotatabledial for operating said mechanism, means for permitting the dial torotate backward only a portion of its forward rotation, and meansoperated by said backward rotation of the dial for causingthe saidmechanism to transmit impulses and forlocking said dial against rotationin either direction during said operation of the mechanism.

8. In a calling device, a rotatable dial, an impulse wheel, means forrotating said wheel, means for normally locking said wheel againstrotation, and means operated by a slightly backward rotation of saiddial after a forward rotation for releasing said impulse wheel and forlocking said dial against rotation in either direction during saidmovement of the wheel.

9. In a calling device, a rotatable dial having finger holes, astationary member carrying symbols normally visible through said fingerholes, an impulse wheel, means for normally locking said Wheel againstrotation, means for rotating said wheel in accordance with the forwardrotation of said wheel, means for rotating said wheel backward a smallportion of its forward rotation when said dial is released, and meansoperated by said limited backward rotation for releasing said wheel, forlocking said dial against rotation and for hiding said symbols from Viewduring the movement of said wheel.

In witness whereof, I hereunto subscribe my name this 20th day of July,A. D., 1917.

OSVALD E. RASMUSSEN.

Copies otthis patent may be obtained (or five cents each, by addressingthe flommissioner or Pateata, Washington. n. G."

